I'd say Kate

You won't find a 100% replacement because npp has a bunch of very specific plugins, but often those plugins would be unnecessary on Linux because you already have other utilities that perform those jobs. You don't need a plugin to ssh into a server to edit files when you've got sshfs for example.

Anyway you can use Geany on Gnome or Kate on KDE.

Depends on what you want to do. I'm a dirty vim user and use nvim in the terminal. There are a lot of text editors though.

Kate is grate

I use Zed Editor on a daily basis even though they push AI in it (it's purely opt-in, thankfully)

For alternative software, I usually ask AlternativeTo : https://alternativeto.net/software/notepad-plus-plus/?platform=linux&license=opensource

Edit: Some people seem to disagree and I'd like to know if it's related to Zed, AI in Zed or AlternativeTo, thanks in advance!

If its the ui you are looking for there is notepadqq

A must-be joke: vim

And seriously, Sublime

There are better text editors. Swearing by that one is kind of a joke.

Geany